Business Mathematics Brief 12th Edition by Stanley Salzman ,Gary Clendenen, Charles Miller

Exercise 260

Round each of this number first to the nearest ten, then to the nearest hundred, and finally to the nearest thousand. Go back to the original number each time before rounding to the next position. (See Example.)
Rounding Whole Numbers
Round each number as indicated.
(a) 579 to nearest ten
(b) 34,127 to nearest thousand
(c) 475,871 to the nearest ten thousand
(d) 79,625 to nearest thousand
SOLUTION
(a) Step 1 Locate the tens place and underline.

Step 2 The first digit to the right of the underlined digit is 9, which is greater than 5. Therefore, increase the digit in the tens place from 7 to 8. Step 3 Change all digits to the right of the tens place to zero. In other words, change the 9 in the ones place to a zero.
579 rounded to the nearest ten is 580.
Quick TIP
When rounding a number, look at the first digit to the right of the digit being rounded. Do not look beyond this digit.
(b) Step 1 Locate the thousands place and underline. 3 4 ,127 Step 2 Since the digit to the right of the thousands place is 1 (less than 5), do not change the 4 in the thousands place. Step 3 Change all digits to the right of the thousands place to zeros.
34,127 rounded to the nearest thousand is 34,000
(c) Step 1 Locate the ten thousands place and underline. 4 7 5,871 Step 2 Since the digit to the right of the ten thousands place is 5, which falls in the category of 5 or more, increase the 7 to an 8. Step 3 Change all digits to the right of the tens thousands place to zeros: 480,000
(d) Step 1 Locate the thousands place and underline. 7 9 ,625 Step 2 The number to the right of the underlined number 9 above is 5, which falls in the 5 or more category. Thus, increase the 9 by 1 to 10. Place a 0 in the thousands place and carry 1 to the ten thousands place changing the 7 to an 8. Step 3 Change all digits to the right of the thousands place to zeros: 80,000